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It sounds like the memory limit on your server is set too low for Magento to run. In your .htaccess, try to set the memory_limit to something like 128 MB:

php_value memory_limit 128M

If that doesn’t help, you can try to contact your host and ask if they can increase the memory limit (unlikely), or alternatively change hosting provider.

So the answer form the support was:
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Dear Customer,

You can manage all PHP settings with the help of your local php.ini file. In order to use it, you need to create a php.ini file under the folder with your PHP scripts, with the necessary PHP settings. For example, if you need to change the upload_max_filesize for one of your scripts under your public_html to 8M you should create a php.ini file under the folder with the following content:
[PHP]
upload_max_filesize = 8M

Feel free to contact us in case of any further troubles.
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I renamed php.ini.sample in the magento folder to php.ini and editied it. I changed max memory to 128 and then....
i got a new error about pdo_mysql but I managed to activate it thanks to the following forum thread: